Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2008-01-29
2008-01-29
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
11318059
ABSTRACT:
An integrated charge pump is provided, comprising: a pump capacitor having a first terminal and a second terminal; a control unit, which operates the charge pump in an alternation between a first phase and a second phase; a first switching device in order to charge the pump capacitor with a pump voltage in the first phase; a second switching device in order to pull the potential of the first terminal to a predetermined potential in the second phase, and in order to connect the second terminal of the pump capacitor to an output node, the second switching device having a first transistor in order to connect the second terminal of the pump capacitor to the output node, a substrate terminal of the first transistor being fixedly connected to the output node; and the second switching device pulling the first terminal to the predetermined potential with a gradient, the gradient being chosen such that at no point in time is a diode breakdown voltage exceeded in the first transistor.
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Chi-Chang Wang and Jiin-Chuan Wu, “Efficiency Improvement in Charge Pump Circuits”, IEEE Journal of Solid-State Circuits, vol. 32, No. 6, Jun. 1997, pp. 852-860.
Infineon - Technologies AG
Patterson & Sheridan L.L.P.
Zweizig Jeffrey
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